I do not have much info on the Schneider clan other than they were from Alt Messer colony WSW of Saratov. Obermonjou is on the East side of the Volga, ENE of Saratov so it is unlikely we are related. I did a quick look in the 1907/08 ship manifests but did not locate your ancestors on any ship list for that time period.
There is an Anton and a Bernard Schneider listed in the B.C. death online death index that may be sons or grandsons of your ancestors?
Good luck in your search!